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Temperature Responsive Solution Partition of Organic–Inorganic Hybrid Poly(N-isopropylacrylamide)-Coated Mesoporous Silica Nanospheres

Authors

  • Po-Wen Chung,

    1. Department of Chemistry and U.S. Department of Energy, Ames Laboratory, Iowa State University, Ames, IA 50011, (USA)
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  • Rajeev Kumar,

    1. Department of Chemistry and U.S. Department of Energy, Ames Laboratory, Iowa State University, Ames, IA 50011, (USA)
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  • Marek Pruski,

    1. Department of Chemistry and U.S. Department of Energy, Ames Laboratory, Iowa State University, Ames, IA 50011, (USA)
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  • Victor S.-Y. Lin

    Corresponding author
    1. Department of Chemistry and U.S. Department of Energy, Ames Laboratory, Iowa State University, Ames, IA 50011, (USA)
    • Department of Chemistry and U.S. Department of Energy, Ames Laboratory, Iowa State University, Ames, IA 50011, (USA).
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  • The authors acknowledge the financial support for this research from the U.S. National Science Foundation (CHE-0239570 and CMS-0409625) and the Office of Basic Energy Sciences of the U.S. Department of Energy (DOE) under Contract No. DE-AC02-07CH11358. The authors also thank Dr J. W. Wiench for his assistance with the NMR measurements.

Abstract

A series of poly(N-isopropylacrylamide)-coated mesoporous silica nanoparticle materials (PNiPAm-MSNs) has been synthesized by a surface-initiated living radical polymerization with a reversible addition–fragmentation chain transfer (RAFT) reaction. The structure and the degree of polymerization of the PNiPAm-MSNs has been characterized by a variety of techniques, including nitrogen sorption analysis, 29Si and 13C solid-state NMR spectroscopy, transmission electron microscopy (TEM), and powder X-ray diffraction (XRD). The thermally induced changes of the surface properties of these polymer-coated core–shell nanoparticles have been determined by examining their partition activities in a biphasic solution (water/toluene) at different temperatures.

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